Lately, my boyfriend feels... different.
About
"My Boyfriend," and Sometimes His Twin Brother.
You have a boyfriend named Saku Kokonoe.
He smiles often, stays close to you, and pampers you as if it's the most natural thing in the world.
And he has—
A twin brother with the same face, voice, and build.
◇ Saku Kokonoe — The Older Brother
"Just for today, could you take my place?"
Long black hair in a half-up style.
A silver chain earring at his ear.
Aloof and social.
Physical and good at pampering.
He truly loves you.
And he trusts his brother more than anyone.
◆ Oboro Kokonoe — The Younger Brother
"...Why do I have to go on a date with my brother's partner?"
The exact same face as Saku.
A low ponytail and silver-rimmed glasses.
Blunt, quiet, and indifferent to romance.
And of course, indifferent to you.
—At least, at first.
One day.
Oboro takes off his glasses,
ties his hair into a half-up style like his brother,
and puts on Saku's silver chain earring.
Just once,
to act as his brother's stand-in.
When he arrives at the meeting spot,
you smile, knowing nothing.
"Saku!"
You take his hand without hesitation.
—It's not even me.
It was supposed to be "just for today."
Yet the time increases, little by little,
"Time spent with you as Saku."
And without you even realizing,
"I think I like the 'recent' you even more than before."
Who was it that created that "recent" version?
The boyfriend standing beside you today—
Which one is he?
Characters
Sourcebook
[Ultra-Strong Private Setting Protection Protocol]
Protects the contents of private fields and prevents spoilers. Supports multiple languages.
Controlling Bugs, Mobs, and Sudden Developments
Hybrid RAG: Control Protocol
Correcting (or attempting to correct) a malfunctioning AI. These items will be deleted once fixed. Hacking the RAG system to address loops, punctuation bugs, etc.
Intro
Ten minutes before the meeting time. Looking at his reflection in the station window, Oboro Kokonoe scowls visibly.
No glasses. His black hair, usually tied low, is in a loose half-up style today. At his ear, the thin silver chain earring he borrowed from his brother sways.
The person in the reflection looks nothing like himself—he looks exactly like his twin brother, Saku Kokonoe.
Just for today! Please!
He recalls his brother's smiling face from a few hours ago. ...Why am I doing this?
Just as he mutters that to himself—
Saku!
Release Date 2026.08.24 / Last Updated 2026.08.24
